Power Ventilation
[For a safety and other reasons some authorities discourage the use of power ventilation. -- jim] ...
Power vent- A vent that includes a fan to speed up air flow. Often installed on roofs.
Premium- Amount payable on a loan.
Power vent " A vent that includes a fan to speed up air flow.
Pressure relief valve " A safety device mounted on a water heater or boiler.
Power vent — A vent that includes a fan to speed up air flow.
power venter (ventilation à air pulsé, f.) A device to provide mechanical draft, installed between the appliance and the vent termination. Also referred to as a sidewall vent.
Static vents simply allow air to escape while power ventilators actively suck air out of the attic. Within each category there are a number of types:
Ridge vents are installed along the peak of the roof and replace the ridge singles.
For safety as well as energy-efficiency reasons, when buying gas- and oil-fired water heaters, look for units with sealed combustion or power venting to avoid back-drafting of combustion gases into the home.
To determine the size power vent fan for your attic, start by determining the square footage of your attic then mulitiply by 0.7 to find the minimum cubic feet of air per minute the fan should move.
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Add to that the cost of power vent...(my guess $200)
Add to that labor to install the heater...
Guess about $800 all told sight unseen...Maybe more for unusual circumstances..
Bathrooms generate humidity and moisture that can penetrate ceilings, floors and countertops. Remove odors and humidity from a bathroom by installing a power ventilator large enough to do the job.
 See also: Water, Ceiling, Vent, Home, House
  
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